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Search Results: 1 - 10 of 12763 matches for " Jae Ho Choi "
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On Certain Subclasses of Multivalent Functions Associated with a Family of Linear Operators  [PDF]
Jae Ho Choi
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.14040
Abstract: Making use of a linear operator Iλp(a,c), which is defined here by means of the Hadamard product (or convolution), we introduce some new subclasses of multivalent functions and investigate various inclusion properties of these subclasses. Some radius problems are also discussed.
Applications of Multivalent Functions Associated with Generalized Fractional Integral Operator  [PDF]
Jae Ho Choi
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.31001
Abstract:
By using a method based upon the Briot-Bouquet differential subordination, we investigate some subordination properties of the generalized fractional integral operator \"\" which was defined by Owa, Saigo and Srivastava [1]. Some interesting further consequences are also considered.
Argument Estimates of Multivalent Functions Involving a Certain Fractional Derivative Operator  [PDF]
Jae Ho Choi
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.52011
Abstract:

The object of the present paper is to investigate various argument results of analytic and multivalent functions which are defined by using a certain fractional derivative operator. Some interesting applications are also considered.

Applications for Certain Classes of Spirallike Functions Defined by the Srivastava-Attiya Operator  [PDF]
Jae Ho Choi
Advances in Pure Mathematics (APM) , 2018, DOI: 10.4236/apm.2018.86035
Abstract: Let the function f be analytic in U={z:z∈C and?\"\"<1} and be given by \"\". In this paper, making use of the Srivastava-Attiya operator Ls,b, we introduce two classes of analytic functions and investigate some convolution properties and coefficient estimates for these classes. Furthermore, several inclusion properties involving these and other families of integral operators are also considered.
On Differential Subordinations of Multivalent Functions Involving a Certain Fractional Derivative Operator
Jae Ho Choi
International Journal of Mathematics and Mathematical Sciences , 2010, DOI: 10.1155/2010/952036
Abstract: We investigate several results concerning the differential subordination of analytic and multivalent functions which is defined by using a certain fractional derivative operator. Some special cases are also considered. 1. Introduction and Definitions Let denote the class of functions of the form which are analytic in the open unit disk Also let denote the class of all analytic functions with which are defined on . If and are analytic in with , then we say that is said to be subordinate to in , written or , if there exists the Schwarz function , analytic in such that , and In particular, if the function is univalent, then the above subordination is equivalent to and . Let , and be complex numbers with Then the Gaussian hypergeometric function is defined by where is the Pochhammer symbol defined, in terms of the Gamma function, by The hypergeometric function is analytic in and if or is a negative integer, then it reduces to a polynomial. There are a number of definitions for fractional calculus operators in the literature (cf., e.g., [1, 2]). We use here the Saigo-type fractional derivative operator defined as follows (see [3]; see also [4]). Definition 1.1. Let and . Then the generalized fractional derivative operator of a function is defined by The function is an analytic function in a simply-connected region of the -plane containing the origin, with the order for and the multiplicity of is removed by requiring that be real when . Definition 1.2. Under the hypotheses of Definition 1.1, the fractional derivative operator of a function is defined by With the aid of the above definitions, we define a modification of the fractional derivative operator by for and . Then it is observed that also maps onto itself as follows: It is easily verified from (1.8) that Note that , and , where is the fractional derivative operator defined by Srivastava and Aouf [5, 6]. In this manuscript, we will use the method of differential subordination to derive certain properties of multivalent functions defined by fractional derivative operator . 2. Main Results In order to establish our results, we require the following lemma due to Miller and Mocanu [7]. Lemma 2.1. Let be univalent in and let and be analytic in a domain containing with when . Set , and suppose that(1) is starlike (univalent) in ,(2) .If is analytic in , with , , and then and is the best dominant. We begin by proving the following Theorem 2.2. Let and , and let , , , and . Suppose that is univalent in and satisfies If and then and is the best dominant. Proof. Define the function by Then is analytic in with . A
The Pectoral Branch Arising from the Subscapular Artery: Case Report of a Rare Variation  [PDF]
Jae-Hee Park, Jae-Ho Lee, In-Jang Choi
Forensic Medicine and Anatomy Research (FMAR) , 2016, DOI: 10.4236/fmar.2016.44008
Abstract: Variations in the upper limbs are common and are the main causes for iatrogenic injury during invasive procedures. A rare division of the axillary artery was found on the left side of a Korean cadaver during an educational dissection. The subscapular artery originated from the second part of the axillary artery. And then it gave off an aberrant branch to the pectoralis major muscle, as pectoral branch. The author describes this previously unreported case and discusses its prevalence and the clinical implications.
Landscape Analysis of the Effects of Artificial Lighting around Wetland Habitats on the Giant Water Bug Lethocerus deyrollei in Jeju Island
Choi, Ho,Heungtae Kim,Jae Geun Kim
Journal of Ecology and Field Biology , 2009,
Abstract: We conducted a landscape analysis to investigate the possibility of adverse effects of anthropogeniclight sources, such as roads and residential buildings, on Lethocerus deyrollei on Jeju Island. Wetlandsinhabited by L. deyrollei had fewer anthropogenic structures within a 3 km radius that had the potential toproduce artificial light at night than wetlands not inhabited by L. deyrollei. In particular, the presence of artificiallights within a 1 km radius appears to reduce the probability of inhabitation by L. deyrollei. Our results suggestthat artificial light sources may be critical determinants of L. deyrollei inhabitation patterns in a landscape, andthat habitats that have a buffer area of at least 600~700 m radius free from residential buildings are the mostappropriate habitats for L. deyrollei.
Design and Implementation of FFPIV Scheme for Closed Loop Motion Controller  [PDF]
Ngo Ha Quang Thinh, Jae-Gark Choi, Won-Ho Kim
Intelligent Control and Automation (ICA) , 2014, DOI: 10.4236/ica.2014.52005
Abstract:

To satisfy the requirements of motion control for industrial machine, a multi-axis motion controller based on DSP is developed in this paper. The motion controller consists of DSP which plays a main role in this design; DPRAM to make sure the rapid and reliable communication with host; FPGA to handle the task of address decoder and receiving feed-back encoder signal; and several peripheral logic circuits. In the part of hardware design, overall structure of motion control system is presented. Then, the Feed-Forward Proportional-Integral-Velocity (FFPIV) scheme which introduces KV in term of velocity loop to achieve the accurate, smooth and real-time response is proposed in the software developing part. The experiment data are carried out to indicate that this motion controller has advantages of superior performance and highly machining precision.

Reply: Anomalous Muscles in Carpal Tunnel Associated with Neurovascular Variation: Case Report and Brief Review  [PDF]
Kiwook Yang, Hyunsu Lee, Jae-Ho Lee, In-Jang Choi
Forensic Medicine and Anatomy Research (FMAR) , 2015, DOI: 10.4236/fmar.2015.31005
Abstract: Gantzer’s muscle is an additional muscle in the forearm. We studied the incidence and the morphology of Gantzer’s muscle and its relation with neurovascular structures. However, unlike the previous suggestion by Eid et al., there is no significant difference in the frequency of the variations of these nerves whether Gantzer’s muscle is present or not.
Dramatic Improvement of Long Lasting Post-Inflammatory Hyperpigmentation by Oral and Topical Tranexamic Acid  [PDF]
Jae Kyung Kim, Sung Eun Chang, Chong Hyun Won, Mi Woo Lee, Jee Ho Choi, Kee Chan Moon
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2012, DOI: 10.4236/jcdsa.2012.22014
Abstract: Post-inflammatory hyperpigmentation is common problem, but its treatment still remains challenging. Tranexamic acid has been used to treat or prevent excessive bleeding loss in various medical conditions. There have been some reports of the effect of oral and topical tranexamic acid for treatment of pigmented disorder. Herein we report on a case of female patient who showed improvement of PIH after oral and topical tranexamic acid administration.
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